Product: Calvin Klein Cotton Combo Set Shirts (likely a set of four)

Key Features:

 * Brand: Calvin Klein, as indicated by the prominent "CK Calvin Klein" logo on the hanging tag and the small embroidered "ck" logo on the chest pocket of each shirt.

 * Material: Described as "cotton," which suggests a comfortable and breathable fabric.

 * Style: These appear to be men's casual shirts with a classic design. They have full sleeves and a single chest pocket.

 * Colors: The set includes a stack of four solid-colored shirts. The colors, from top to bottom, are:

   * Sky Blue

   * Light Yellow (or a pastel butter yellow)

   * Aqua Blue (a slightly lighter shade than the top shirt)

   * Mint Green (a very light, pastel green)

 * Details:

   * The shirts are neatly folded, showing the collar and front button placket.

   * The embroidered "ck" logo is placed on the outer edge of the chest pocket.

   * The hanging tag features the full "Calvin Klein" brand name below the larger "CK" logo, a hallmark of the brand's identity.